216571473 has 12 divisors (see below), whose sum is σ = 326426880. Its totient is φ = 138103416.

The previous prime is 216571451. The next prime is 216571493. The reversal of 216571473 is 374175612.

It is a happy number.

216571473 is a `hidden beast` number, since 2 + 16 + 571 + 4 + 73 = 666.

216571473 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216571473 - 2¹⁴ = 216555089 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (216571423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 522913 + ... + 523326.

It is an arithmetic number, because the mean of its divisors is an integer number (27202240).

Almost surely, 2^216571473 is an apocalyptic number.

216571473 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

216571473 is a deficient number, since it is larger than the sum of its proper divisors (109855407).

216571473 is a wasteful number, since it uses less digits than its factorization.

216571473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046268 (or 1046265 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 216571473 is about 14716.3675205534. The cubic root of 216571473 is about 600.5286756999.

The spelling of 216571473 in words is "two hundred sixteen million, five hundred seventy-one thousand, four hundred seventy-three".